Brake-shoe.



FITZ WILLIAM SARGBNT.

BRAKE SHOE.

APPLICATION FILED MAE. 8, 1911.

1,001,083'i Patented Aug. 22, 19-11.

. $442M My :TED srnrns PATENT OFFICE.

FITZ WILLIAM SARGENT, 0F MAI-IWAI-I, NEW JERSEY, ASSIGNOR TO EDWARD H.

' FALLOWS, OF NEW YORK, N. Y.

BRAKE-SHOE.

Specification of Letters Patent.

Patented Aug. 22, 1911.

To all whom "it may concern:

a resident of Mahwah, in the county of Bergen and State of New Jersey, have made and invented certain new and useful Improvements in Brake-Shoes, of which the 5 which lubricating action will further refollowing is a specification.

My invention relates to an improvement; in brake shoes, the object thereof being to 1 so construct an article of this kind that the flange of the wheel will be subjected to less f injury than is now commonly met with in}, the use of brake shoes of the type employed 3 the present time.

with flanged wheels.

In the use of flanged brake shoes, it is; found that the flange of the wheel is particularly liable to injury, due largely, to the heat developed in the comparatively thin flange of the wheel by contact with the 1 flange of the shoe and which heating of the frame is liable to cause cracks to be formed brake shoe, and which pockets are filled with a composition composed wholly or principally of a non-metallic substance, or such substance selected and compounded with a view to avoiding as much as possible the grinding action and consequent generation of heat between the flange of the shoe and the flange of the wheel when the shoe is pressed against the latter. That is, I prefer to have the maximum braking effect produced by the contact of the shoe on the tread of the wheel, that portion of the shoe extending over the flange acting more as a guide to hold the shoe in place than for frictional purposes.

The composition employed is such that it will compact and polish without wearing.

pared with the specific heat of the body of the shoe, which is commonly formed from cast iron, so that the composition, in addition to being non-grinding in its nature, will-also be preferably compounded with a view to securing a certain amount of lubricating action between the flange portion of the brake shoe and the flange of the wheel,

duce the grinding action between the shoe and the wheel flange, and as a consequence reduce the heating action incident to a metallic contact extending throughout the entire bearing surface of the shoe upon the wheel in brake shoes of the form in use at With the ob 'ects above enumerated in view, my invention consists in the improved brake shoe illustrated in the accompanying drawing, described in the following specification and hereinafter particularly claimed.

In the drawing: Figure 1 is a view showing a transverse section of my improved brake shoeyFig. 2 is a view showing the same as seen from a position beneath Fig. 1; Fig. 3 is a similar view showing a different disposition of the pockets and filling material therein; Fig. 4: is a view showing a transverse section of a brake shoe wherein the pockets, with filling material therein, are used in addition to openings extending through the flange of' the shoe; Fig. 5 is a view showing the same as seen from a position beneath Fig. 4;Fi'g. 6 is a view showing a transverse section of. the pockets and filling material extending across both the flange portion and face of the shoe; Fig. 7 is a view showing the shoe seen from a position below Fig. 6; Fig. .8 is a view similar to Fig 6 and showing a similar shoe, openings extending through the flange being, however, used in addition to the pockets; Fig. 9 is a view showing the shoe illustrated in Fig. 8, as seen from a position beneath suchfigure, and, Fig. 10 is a similar view showing a slightly different disposition of the pockets and filling material.

In Figs. 1 and 2, 11 is the body portion of the brake shoe, .and, 12 the flange thereof,

the bodyportion. being adapted to engage placed within a recess provided for it in the brake shoe, and which recess is located mainly in the flange portion of the shoe, but preferably extends slightly into the wearing face thereof, so that the composition will come into contact with the flange of the wheeland that portion of the tread adjacent thereto, where the maximum wear, due to contact with the rails, occurs. The filling material may be in a single mass as in Fig. 2, or divided into two or more bodies as shown at 14:, Fig. 3.

In Figs. 4 and 5, I have shown pockets filled with composition 15 used in addition to openings 16 extending through the flange of the shoe, said openings serving to permit material worn from the shoe and from the bodies of composition to readily escape from between the shoe and wheel face, and which openings also secure a more effective dissipation of the heat, providing, as they do,

greater radiating surface for the shoe, and also passages through which a flow of air may occur.

In Figs. 6 and 7 I have shown the pockets with fillingmaterial 17 as extending through the flange portion and across the face of the shoe; and in Figs. 8 and 9 I have shown similar pockets with filling material 18 used in addition to openings 19 extending through the flange of the shoe. If desired, the pockets and filling material may extend diagonally acrossthe face of the shoe and flange as shown at 20, Fig. 10.

My improved brake shoe may be made by first forming a shoe with pockets or recesses in its surface, and then placing the non-metallic composition in the pockets, the same in such case being preferably in plastic form, or, the said composition may be first molded or otherwise formed into blocks of suitable form and size, which blocks are then placed in a mold and the molten metal of which the shoe is to be formed poured about the blocks.

The non-metallic, or semi-metallic composition, wherewith the recess in the shoe is filled, may be formed from various ingredients so long as it retains the characteristics of being a non-grinding composition, and as explained, preferably a composition having to some degree lubricating properties. Among such ingredients are graphite, asbestos, pulverized trap-rock, and. similar substances having a higher specific heat than cast iron,-the same being mixed and bound together with any suitable binding material.

I, however, recommend that the compositions be formed from the ingredients mentioned below; as I have obtained better results by using compositions so formed than with any other compositions at present known to me.

In case thecoinposition is to be formed as a plastic and forced into pockets formed in the shoe, I recommend:

Fire clay 1 part Iron borings 3 parts Crushed iron ore 3 Coal tar 1 part Asphalt the ingredients being thoroughly mixed and heated to about 112 F. and pressed into the pockets of the brake shoe.

In case the composition is to be first formed into blocks to be placed in molds and the molten metal of the shoe poured aboutthem, I recommend:

Fire clay 8 parts Crushed slag 6 Graphite 3 1 tion having a flange adapted to contact with the flange of a wheel, and having a recess or pocket formed in said flange and extending into the portion of the shoe which contacts with the tread of the wheel, said recess being filled with a non-metallic substance having lubricating properties and the area thereof being small as compared with the entire bearing surface of the shoe.

2. A brake shoe comprising a body portion formed from cast iron, and'adapted to contact with a car wheel, said body portion having a flangeadapted to contact with the flange of a wheel, and having-a recess'or pocket formed in said flange and extending into theportion of the shoe which contacts a with the tread of the wheel, said recess being filled with a non-metallic composition,

one'ingredient of which has lubricating properties the area of .said'recess being small. as compared with the entire bearing surface of the shoe. i

3. A brake shoe comprising a bodyportion formed from cast-iron and adapted to contact with the car wheel, said body portion having a flange adapted to contact with the flange of awheel, and having a recess or pocket formed in said flange portion and filled with a non-metallic composition, one ingredient of which has lubricating properties the area of said recess being small as compared with the entire bearing surface of the shoe.

4. A brake shoe, having a flange adapted to contact with the'flange of a wheel, and

having a recess or pocket formed in said flange and filled with a non-metallic substance, said flange having holes extending therethrough.

5. A brake shoe, having a flange adapted to contact with the flange of a wheel and having a recess or pocket formed in said flange extending into the portion of the shoe which contacts with the tread of the wheel; said recess being filled with a nonmetallic substance and said flange portion having holes extending therethrough.

6. A brake shoe, having a flange adapted to contact with the flange of a wheel, and having a recess or pocket formed therein, and with holes extending therethrough, said recess being filled withanon-Inetallic composition, one ingredient of which has lubricating properties.

7 A brake shoe, having a flange adapted to contact with the flange of a wheel, and having a recess or pocket formed in said flange extending into the portion of the shoe which contacts with the tread of the wheel and having holes extending therethrough, said recess being filled with a nonmetallic composition, one ingredient of which has lubricating properties.

8. A brake shoe, comprising a body portion formed from cast iron and adapted to contact with the car wheel, said body portion having a flange adapted to contact with the flange of a Wheel, and having a recess or pocket formed in said flange, said recess being filled with a non-metallic substance having lubricating properties and the area thereof being small as compared with the entire bearing surface of the shoe.

Signed at New York, borough of Manhattan, in the county of New York and State of New York, this 18th day of February, A. D. 1911.

FITZ WILLIAM SARGENT.

Witnesses:

A. V. WALSH, H. M. WHITE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, I). C. 

